South Kvarken (Finnish: Ahvenanrauma, Swedish: Södra Kvarken) is the narrowest stretch of sea between Finnish Åland and Sweden, forming a strait connecting the Sea of Åland and the Bothnian Sea of approximately 30 km (18.5 mi) across.

South Kvarken is located in Baltic Sea
South Kvarken
South Kvarken
Location of South Kvarken

60°08′57″N 19°10′21″E / 60.1492°N 19.1725°E / 60.1492; 19.1725